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        Product List
        HZW□-12 Type Intelligent High Voltage Dual Power Supply Switching Device
        HZW□ -12 type outdoor high voltage intellighent dual power supply switching device is composed of a high voltage vacuum circuit breaker, an intelligent controller and a built-out PT. It is used in the dual power supply system with rated voltage 12kV or below, rated current up to 630A and three-phase AC 50/60Hz. Once the power cut or undervoltage occurs in one way of power supply, it can automatically switch to the other way of normal power supply to ensure the continuity of power supply. Having the interlocking functions of short-circuit current protection and overload current protection, it can efficiently avoid unnecessary power supply impact again once the load fault occurred. When the power cut occurs due to the fault happened in common used power supply, the device can realize the automatical switching to the standby power supply to ensure the reliability and safety of the equipments. It can effect the selective switching between the two ways of power supply according to the needs of load. As an important electric control device which ensures the continuous power supply, it is especially suitable for those important locations where the power outages are not allowed. And as a new generation of automatic change and automatic recovery type of dual power supply automatic switching device, it has many advantages of novel design, perfect performance, safety & reliability, high automatization and wide application range, etc.. The product ensures the complete disconnecting between the two ways of high voltage power supply in design, and adopts the perfect and reliable mechanical and electric interlock, as a result, it is highly safe and reliable. As a control and protection device for dual power supply system, it is applicable for the dual power supply users who require high reliability and satety of the power supply. The device is widely used in 10kV distribution line for oil field, mine, metallurgy, chemical industry, railway, communication and machinery. The product conforms to the standards of IEC62271-100 & GB1984: AC high voltage circuit breaker, IEC60694 & GB/T11022: HV general technical requirement of switch and control apparatus.
        Ambient conditions
        1. Altitude: ≤3000m;
        2. Ambient temperature: -40℃~+45℃;diurnal temperature rang ≤25℃;
        3. Wind speed: ≤35m/s, equivalent to wind pressure of 700Pa;
        4. Earthquake intensity: ≤grade 8;
        5. Relative humidity: monthly average ≤90%; daily average ≤95%;
        6. Ice thickness: ≤10mm;
        7. Sunlight intensity: ≤1000W/m2
        8. Pollution degree: ≤Ⅳ(GB5582);
        9. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration;
        10. Neutral grounding mode: neutral non grounding, neutral grounding via arc-extinguishing coil, neutral grounding via low-resistance.

        Technical specification
        No. Item Unit Data
        1 Rated voltage kV 12
        2 Rated current A 630
        3 Rated short-circuit breaking current kA 20
        4 Rated short-circuit making current(peak) 50
        5 Rated peak withstand current(peak) 50
        6 Rated short-time withstand current 20
        7 Rated short-circuit duration S 4
        8 Rated insulation
        Lightning impulse withstand voltage(peak) kV 75
        1min P.F withstand
        Dry test 42
        Wet test 34
        9 Rated operating sequence O-0.3s-CO-180s-CO
        10 Breaking times of rated current times 30
        11 Mechanical life 10000
        12 Rated operating voltage(opening/closing coil) V DC220,DC110,AC220
        13 Rated current for over-current tripping device A 5
        14 Current ratio of CT /5 200/5 400/5 600/5
        15 Contact gap mm 9±1
        16 Contact over-travel 3±1
        17 Allowed accumulative wear thickness for moving and static contacts 3
        18 Average opening speed m/s 1.0±0.3
        19 Average closing speed 1.0±0.25
        20 Opening time At highest rated operating voltage ms ≤60
        At lowest voltage operating voltage ≤100
        21 Closing time ms ≤100
        22 Contact close-bouncing time ≤2
        23 Three-phase opening/closing non-simultaneity ms ≤2
        24 DC resistance for each phase loop μΩ ≤200
        25 Energy storage motor Rated voltage V DC 220
        Rated power W 70
        Energy storage time S ≤10
        26 Net weight kg 185

        Main function features
        1. The device adopts the voltage on A incoming line or B incoming line to judge the states of the circuit breaker and the automatical isolating switch, and to switch automatically;
        2. The device has the functions of overcurrent protection; it can realize time overcurrent limiting and quick breaking protection by detecting the running current on load side. It also has the single-shot reclosing and locking function;
        3. The device has the electricity-coming delay closing function. It also can be set with the prior power supplying function, the device can automatically switch to the side to supply power once the power supply is restored on the set main power supply side, the vacuum circuit breaker automatically trips due to no voltage on incoming line, and the automatical isolating switch doesn’t change the direction. When the power is preferentially supplied to any side next time, it will automatically turn to another sied, therefore the vacuum circuit breaker will automatically close. It also can be opened manually and the switch is locked if examimation and maintenance is needed.
        4. The automatical isolating switch stops in the middle position to ensure the safety of the electrictity usage.
        Outline and installation dimension